Abstract
A series of (1-x)Bi0.48La0.02Na0.48Li0.02Ti0.98Zr0.02O3-xNa0.73Bi0.09NbO3 ((1-x)LLBNTZ-xNBN) (x = 0-0.14) ceramics were designed and fabricated using the conventional solid-state sintering method. The phase structure, microstructure, dielectric, ferroelectric and energy storage properties of the ceramics were systematically investigated. The results indicate that the addition of Na0.73Bi0.09NbO3 (NBN) could decrease the remnant polarization (Pr) and improve the temperature stability of dielectric constant obviously. The working temperature range satisfying TCC150 °C ≤±15% of this work spans over 400 °C with the compositions of x ≥ 0.06. The maximum energy storage density can be obtained for the sample with x = 0.10 at room temperature, with an energy storage density of 2.04 J/cm3 at 178 kV/cm. In addition, the (1-x)LLBNTZ-xNBN ceramics exhibit excellent energy storage properties over a wide temperature range from room temperature to 90 °C. The values of energy storage density and energy storage efficiency is 0.91 J/cm3 and 79.51%, respectively, for the 0.90LLBNTZ-0.10NBN ceramic at the condition of 100 kV/cm and 90 °C. It can be concluded that the (1-x)LLBNTZ-xNBN ceramics are promising lead-free candidate materials for energy storage devices over a broad temperature range.
Highlights
In order to meet the increasing demand for electrical energy storage capacitors in the field of pulse power applications, especially dielectric ceramic capacitors for high energy storage density devices, have been widely investigated and played more and more important roles[1,2,3,4]
The results demonstrate that the (1-x)LLBNTZ-xNBN ceramics are promising for energy storage application over a broad temperature range
It can be seen that the lattice parameters and unit cell volume exhibit tiny fluctuations in the range of x from 0 to 0.14, which indicates that the (1-x)LLBNTZ-xNBN ceramics have a stable monoclinic structure for all the samples at room temperature
Summary
In order to meet the increasing demand for electrical energy storage capacitors in the field of pulse power applications, especially dielectric ceramic capacitors for high energy storage density devices, have been widely investigated and played more and more important roles[1,2,3,4]. BNT-based ceramics have been recognized as potential lead-free ferroelectric materials owing to their large saturated polarization. It is very important to reduce the value of Pr and improve the thermal stability of BNT-based ceramics for their applications in energy storage capacitors. The energy storage density and the temperature stablity of BNT-based ceramics can be improved by Nb doping or the addition of niobates[16, 37,38,39]. There are few reports of temperature stability on the energy storage and dielectric properties for BNT-based ceramics that modified by Na0.73Bi0.09NbO3. In order to obtain a high energy storage density and an excellent dielectric temperature stability, a new lead-free ferroelectric solid solution of (1-x)LLBNTZ-xNBN ceramics were reported. The results demonstrate that the (1-x)LLBNTZ-xNBN ceramics are promising for energy storage application over a broad temperature range
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